Which of the Following Statements Is Correct

Which of the following statements is correct?

A) The use of additional intermediaries will often increase the level of contactual efficiency.
B) Specialization and division of labor as well as contactual efficiency considerations are all that is needed to make decisions about intermediary usage.
C) Contactual efficiency and labor efficiency provide a framework for deciding whether or not to use intermediaries in the channel.
D) Specialization and division of labor does not lead to contactual efficiency.
E) The use of retailers provides greater contactual efficiencies than the use of wholesalers.